Not able to spin up Context module

It is not possible to search up Context module from the list.
When using direct link the name is not visable;
https://simplytest.me/configure?project=context

When trying to launch the module it gives this error:

This may be the error:

In RootPackageLoader.php line 160:

require.drupal/ is invalid, it should have a vendor name, a forward slash,
and a package name. The vendor and package name can be words separated by -
, . or _. The complete name should match "^[a-z0-9]([_.-]?[a-z0-9]+)*/[a-z0
-9](([_.]?|-{0,2})[a-z0-9]+)*$".

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